非谓语动词 At the beginning of the class,the noise of非谓语动词At the beginning of the class,the noise of desks ___could be heard outside the classroom.being opened and closed我选的是 opened and closed为什么时态是进行时呢?题

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非谓语动词 At the beginning of the class,the noise of
非谓语动词
At the beginning of the class,the noise of desks ___could be heard outside the classroom.
being opened and closed
我选的是 opened and closed
为什么时态是进行时呢?题中貌似没有明确的时间标志呀.

这是老教材课文the last lesson中的句子.主语是the noise 后有个介词of, 而介词后要接动名词,所以它后面应该出现doing的形式.而desks是被开和关的.所以用了动名词的被动式,即:being done.
所以说答案就成了being opened and closed.
还有,句子中的desks是做后面这个动名词的逻辑主语的.其他如:
Do you mind smoking here?没说是谁吸烟
Do you mind my smoking here?句子是说我吸烟,表示了动名词的执行者或承受者,也就是动名词的逻辑主语.
附:这不是时态,是非谓语动词的形式.